发明名称 |
DRILL-IN FLUIDS AND DRILLING METHODS DRILL-IN FLUIDS AND DRILLING METHODS |
摘要 |
There is provided a method of drilling an oil or gas well, comprising drilling a wellbore into an underground formation in which a drill bit at the lower end of a drill pipe is placed at the bottom of the wellbore; pumping a first drilling fluid into the wellbore; determining the producing zone of the underground formation; and introducing a second drilling fluid into the wellbore through the drill pipe when the borehole is within the producing zone of the underground formation, wherein the second drilling fluid is a high density drill-in fluid, having a composition different from that of the first drilling fluid and including a brine system with at least one dissolved monovalent salt and at least one dissolved divalent salt together with a suspension polymer, said drilling fluid having a density of at least about 1.50 g/cm3 and a plastic viscosity of less than about 50 lbs/100 ft2. |
申请公布号 |
WO9619544(A3) |
申请公布日期 |
1997.02.13 |
申请号 |
WO1995US16818 |
申请日期 |
1995.12.22 |
申请人 |
TETRA TECHNOLOGIES, INC. |
发明人 |
SWARTWOUT, ROSA, T.;STROH, STEPHEN, W. |
分类号 |
C09K8/04;C09K8/08;C09K8/10 |
主分类号 |
C09K8/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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